Question $11$ of $15$

How does a consensus mechanism work?

It prevents nodes on the blockchain from reaching consensus with each other, allowing different versions of the data to be saved and distributed.

It is automatically implemented to reach an agreement on which version of the data should be distributed to the blockchain nodes.

It uses a manual process by which all nodes must check one$-$by$-$one with each other to see if their copies of the data match.

It uses a failsafe mechanism that forces the blockchain to shut down if the different copies of data on each node do not agree with each other.

I don't know this yet.

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